5b2: name the violation in every error message, and the escape a claimed line takes

src/markdown/directive-syntax.test.ts

@@ -70,7 +70,7 @@ test('names the {attrs} keys read out of the alphabetical order canonical form s
 })
 
 test('spells an empty {attrs} only where the brace itself claims the directive', () => {
-  const omitted = 'an empty {attrs} is omitted unless the { itself claims the directive'
+  const omitted = 'an empty {attrs} is omitted unless the { itself claims the directive: this one spells {}'
   assert.equal(fault('::rule {}'), omitted)
   assert.equal(fault(':::panel info {}'), omitted)
   assert.equal(inline(':underline[a]{}'), omitted)
@@ -78,25 +78,25 @@ test('spells an empty {attrs} only where the brace itself claims the directive',
 })
 
 test('names the directive line no spelling reads', () => {
-  assert.equal(fault('::Panel'), 'a directive name reads [a-z][A-Za-z0-9]*')
-  assert.equal(fault('::1panel'), 'a directive name reads [a-z][A-Za-z0-9]*')
-  assert.equal(fault('::panel  info'), 'a directive line reads a name, one bare argument and {attrs}, one space apart')
-  assert.equal(fault('::panel info extra'), 'a directive line reads a name, one bare argument and {attrs}, one space apart')
-  assert.equal(fault('::panel{}'), 'a directive line reads a name, one bare argument and {attrs}, one space apart')
-  assert.equal(fault('::panel info{}'), 'a directive line reads a name, one bare argument and {attrs}, one space apart')
-  assert.equal(fault('::panel {a=1} x'), 'a directive line reads a name, one bare argument and {attrs}, one space apart')
+  assert.equal(fault('::Panel'), 'a directive name reads [a-z][A-Za-z0-9]*: this one does not; \\::: keeps the line literal text')
+  assert.equal(fault('::1panel'), 'a directive name reads [a-z][A-Za-z0-9]*: this one does not; \\::: keeps the line literal text')
+  assert.equal(fault('::panel  info'), 'a directive line reads a name, one bare argument and {attrs}, one space apart: this one does not; \\::: keeps the line literal text')
+  assert.equal(fault('::panel info extra'), 'a directive line reads a name, one bare argument and {attrs}, one space apart: this one does not; \\::: keeps the line literal text')
+  assert.equal(fault('::panel{}'), 'a directive line reads a name, one bare argument and {attrs}, one space apart: this one does not; \\::: keeps the line literal text')
+  assert.equal(fault('::panel info{}'), 'a directive line reads a name, one bare argument and {attrs}, one space apart: this one does not; \\::: keeps the line literal text')
+  assert.equal(fault('::panel {a=1} x'), 'a directive line reads a name, one bare argument and {attrs}, one space apart: this one does not; \\::: keeps the line literal text')
 })
 
 test('names the attributes no spelling reads', () => {
   assert.equal(fault('::panel {a=1'), 'the {attrs} closing brace is missing')
   assert.equal(fault('::panel {a="x}'), 'the {attrs} quoted value is unclosed')
   assert.equal(fault('::panel {a="\\uzzzz"}'), 'the {attrs} quoted value is not a JSON string')
-  assert.equal(fault('::panel {a}'), 'an attribute reads key=value, the value bare or double-quoted')
-  assert.equal(fault('::panel {a=}'), 'an attribute reads key=value, the value bare or double-quoted')
-  assert.equal(fault('::panel {=1}'), 'an attribute reads key=value, the value bare or double-quoted')
-  assert.equal(fault('::panel {a=1  b=2}'), 'an attribute reads key=value, the value bare or double-quoted')
-  assert.equal(fault('::panel { a=1}'), 'an attribute reads key=value, the value bare or double-quoted')
-  assert.equal(fault('::panel {a=1 }'), 'an attribute reads key=value, the value bare or double-quoted')
+  assert.equal(fault('::panel {a}'), 'an attribute reads key=value, the value bare or double-quoted: this one does not')
+  assert.equal(fault('::panel {a=}'), 'an attribute reads key=value, the value bare or double-quoted: this one does not')
+  assert.equal(fault('::panel {=1}'), 'an attribute reads key=value, the value bare or double-quoted: this one does not')
+  assert.equal(fault('::panel {a=1  b=2}'), 'an attribute reads key=value, the value bare or double-quoted: this one does not')
+  assert.equal(fault('::panel { a=1}'), 'an attribute reads key=value, the value bare or double-quoted: this one does not')
+  assert.equal(fault('::panel {a=1 }'), 'an attribute reads key=value, the value bare or double-quoted: this one does not')
   assert.equal(fault('::panel {a=1 a=2}'), 'the attribute key a is spelled twice')
 })