Improve several comma related parse errors

- Suggest adding a comma on { 2 3 }
 - Suggest removing a comma on f(1, )

Closes #1341.

projects/core/src/main/resources/data/computercraft/lua/rom/modules/main/cc/internal/syntax/errors.lua

@@ -364,6 +364,48 @@ function errors.table_key_equals(start_pos, end_pos)
     }
 end
 
+--[[- There is a trailing comma in this list of function arguments.
+
+@tparam number token The token id.
+@tparam number token_start The start position of the token.
+@tparam number token_end The end position of the token.
+@tparam number prev The start position of the previous entry.
+@treturn table The resulting parse error.
+]]
+function errors.missing_table_comma(token, token_start, token_end, prev)
+    expect(1, token, "number")
+    expect(2, token_start, "number")
+    expect(3, token_end, "number")
+    expect(4, prev, "number")
+
+    return {
+        "Unexpected " .. token_names[token] .. " in table.",
+        annotate(token_start, token_end),
+        annotate(prev + 1, prev + 1, "Are you missing a comma here?"),
+    }
+end
+
+--[[- There is a trailing comma in this list of function arguments.
+
+@tparam number comma_start The start position of the `,` token.
+@tparam number comma_end The end position of the `,` token.
+@tparam number paren_start The start position of the `)` token.
+@tparam number paren_end The end position of the `)` token.
+@treturn table The resulting parse error.
+]]
+function errors.trailing_call_comma(comma_start, comma_end, paren_start, paren_end)
+    expect(1, comma_start, "number")
+    expect(2, comma_end, "number")
+    expect(3, paren_start, "number")
+    expect(4, paren_end, "number")
+
+    return {
+        "Unexpected " .. code(")") .. " in function call.",
+        annotate(paren_start, paren_end),
+        annotate(comma_start, comma_end, "Tip: Try removing this " .. code(",") .. "."),
+    }
+end
+
 --------------------------------------------------------------------------------
 -- Statement parsing errors
 --------------------------------------------------------------------------------

projects/core/src/test/resources/test-rom/spec/modules/cc/internal/syntax/parser_spec.md

@@ -95,6 +95,48 @@ ## Unclosed parenthesis
    |                   ^ Unexpected end of file here.
 ```
 
+## Missing commas in tables
+
+```lua
+return { 1 2 }
+```
+
+```txt
+Unexpected number in table.
+   |
+ 1 | return { 1 2 }
+   |            ^
+   |
+ 1 | return { 1 2 }
+   |           ^ Are you missing a comma here?
+```
+```lua
+return { 1, 2 3 }
+```
+
+```txt
+Unexpected number in table.
+   |
+ 1 | return { 1, 2 3 }
+   |               ^
+   |
+ 1 | return { 1, 2 3 }
+   |              ^ Are you missing a comma here?
+```
+```lua
+print({ 1, )
+```
+
+```txt
+Unexpected ). Are you missing a closing bracket?
+   |
+ 1 | print({ 1, )
+   |       ^ Brackets were opened here.
+   |
+ 1 | print({ 1, )
+   |            ^ Unexpected ) here.
+```
+
 # Statements
 
 ## Local functions with table identifiers
@@ -368,3 +410,35 @@ ## Unexpected `end`
    |   ^^^
 Your program contains more ends than needed. Check each block (if, for, function, ...) only has one end.
 ```
+
+# Function calls
+
+## Additional commas
+We suggest the user removes additional trailing commas on function calls:
+
+```lua
+f(2, )
+```
+
+```txt
+Unexpected ) in function call.
+   |
+ 1 | f(2, )
+   |      ^
+   |
+ 1 | f(2, )
+   |    ^ Tip: Try removing this ,.
+```
+```lua
+f(2, 3, )
+```
+
+```txt
+Unexpected ) in function call.
+   |
+ 1 | f(2, 3, )
+   |         ^
+   |
+ 1 | f(2, 3, )
+   |       ^ Tip: Try removing this ,.
+```