5b2: name the inline claim's escape where prose reaches it

src/markdown/directive-syntax.test.ts

@@ -91,13 +91,14 @@ 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: 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}'), 'an attribute reads key=value, the value bare or double-quoted: this one does not; \\::: keeps the line literal text')
+  assert.equal(fault('::panel {a=}'), 'an attribute reads key=value, the value bare or double-quoted: this one does not; \\::: keeps the line literal text')
+  assert.equal(fault('::panel {=1}'), 'an attribute reads key=value, the value bare or double-quoted: this one does not; \\::: keeps the line literal text')
+  assert.equal(fault('::panel {a=1  b=2}'), 'an attribute reads key=value, the value bare or double-quoted: this one does not; \\::: keeps the line literal text')
+  assert.equal(fault('::panel { a=1}'), 'an attribute reads key=value, the value bare or double-quoted: this one does not; \\::: keeps the line literal text')
+  assert.equal(fault('::panel {a=1 }'), 'an attribute reads key=value, the value bare or double-quoted: this one does not; \\::: keeps the line literal text')
   assert.equal(fault('::panel {a=1 a=2}'), 'the attribute key a is spelled twice')
+  assert.equal(inline(':mention[@A]{id}'), 'an attribute reads key=value, the value bare or double-quoted: this one does not; \\: keeps the colon literal')
 })
 
 test('breaks the directive on the raw characters a quoted value spells as escapes', () => {
@@ -131,10 +132,10 @@ test('binds an inline directive as a unit, its content balancing brackets like l
 })
 
 test('names the inline directive left unclosed at the end of its line', () => {
-  assert.equal(inline(':mention[@A'), 'an inline directive [content] is unclosed')
-  assert.equal(inline(':mention[@A\nB]'), 'an inline directive [content] is unclosed')
-  assert.equal(inline(':mention[a `b\nc` d]'), 'an inline directive [content] is unclosed')
-  assert.equal(inline(':underline[:status[x'), 'an inline directive [content] is unclosed')
+  assert.equal(inline(':mention[@A'), 'an inline directive [content] is unclosed; \\: keeps the colon literal')
+  assert.equal(inline(':mention[@A\nB]'), 'an inline directive [content] is unclosed; \\: keeps the colon literal')
+  assert.equal(inline(':mention[a `b\nc` d]'), 'an inline directive [content] is unclosed; \\: keeps the colon literal')
+  assert.equal(inline(':underline[:status[x'), 'an inline directive [content] is unclosed; \\: keeps the colon literal')
   assert.equal(inline(':mention[@A]{id=1'), 'the {attrs} closing brace is missing')
   assert.equal(inline(':mention{id=1'), 'the {attrs} closing brace is missing')
   assert.equal(inline(':text{text="a\nb"}'), 'the {attrs} quoted value is not a JSON string')